The five-day hearing, which began today, is expected to look at laws on product labelling and whether regulation needs to be tightened to prevent another incident.

Natasha’s father, Nadim Ednan-Laperouse, founder of the company Wow Toys, said: “As a family now of three, my wife, son and I are still trying to adjust to life without our beloved girl.

“It’s a daily battle and the pain is indescribable. Everything we say and do is a reminder that she isn’t with us; her empty bedroom, school uniform hanging in her wardrobe, her holiday bag packed for her holiday in Nice has never been unpacked. We can’t bear to.”

Sesame is one of 14 allergens that EU law stipulates must be listed in pre-packaged foods.

However, outlets that prepare food on their premises, such as Pret, are not required to individually label their food products with such advice.

The distinction is intended to help small, independent food providers who would struggle to provide such packaging.

Pret a Manger confirmed that its products were not individually labelled with allergen or ingredient information. It pointed to signs on shelves and at tills informing customers that they should speak to a manager, who is trained to provide allergen advice.

A spokesperson for Pret said: “We were deeply saddened to hear about Natasha’s tragic death, and our heartfelt thoughts are with her family and friends.

“We take food allergies and how allergen information is provided to our customers extremely seriously. We will continue to do all that we can to assist the coroner’s inquest.”